[time-nuts] HPZ3801 Failure

[Artek Manuals]

Wes

Some one reversed engineered the supply about 10 years ago and they 
posted the schematic on the WEB....The web link I have no longer works 
so I will email you the schematics of the supply direct.

I will check to see if the files are not already up on KO4BB and if not 
I will post them up there for every one


That being said while troubleshooting my own supply this week I have 
learned the following
1) The supply  ( is not a switcher) can be troubleshot on the bench 
removed ( and unplugged from from the Z3801A.
2) The supply is basically A pre-regulator and two DC-DC converters.By 
cutting one trace you can separate the two and bypass the preregulator 
which seems to me to be overkill if you using a good regulated DC supply 
to feed the thing 36 or more volts into the DC/DC converters is fine
3) The smaller DC-DC converter supplies 5V only ( probably for the 
receiver ???)
4) The larger Lucent converter supplies =15V / -15V /+5V
5) all the DC-DC outputs can be supplied with separate DC supplies of 
good quality



Dave
NR1DX
ArtekManuals.com





On 2/4/2016 12:17 PM, Wes Atchison wrote:
> My HPZ3801 has died.  It appears the internal DC to DC converters have died.
> The fuses (4) I have found on the boards check good with an ohmmeter.  I
> have checked voltage on test points where labeled as a supply.  No voltages
> present.  Is there a schematic available somewhere?  Has anyone repaired a
> Z3801 with similar problems?
>
> Thanks for any help.
>
>
>
> 73,
>
> Wes
>
> WA5TKU
>
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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com

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